Motion Control

Roller Bearings

SKF USA (Kulpsville, PA) offers cylindrical roller bearings with logarithmically crowned rollers that provide improved contact geometry between the roller and raceway, reducing stresses under high loads. The bearings feature a precision-honed inner and outer ring, raceways, and rollers for improved lubricant effectiveness. They incorporate single-, double-, and multiple-row designs differing in arrangement, design, and construction of the retaining flanges. Available bore sizes range in diameter from 0.9843 to 39.3701". Cage materials include molded glass fiber-reinforced polyamide or optional machined brass and pressed steel.

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Rotary Union

Duff-Norton (Charlotte, NC) offers the 1900 Series Rotary Union® that provides a rotating seal between fluids and a revolving roll or drum. Commonly conducted media are water, hot oils, chemicals, hydraulics, and air. The union is designed for very high pressure applications to 10,150 psi, and with maximum temperature ratings to 248 °F. Standard models feature nickel-treated carbon steel or stainless steel construction, and a double-acting thrust bearing and bronze bushing. Sizes range from 1/4 to 3".

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Nanopositioning Controller

PI, L.P. (Auburn, MA) has introduced the E-621.CR modular controller for piezo-driven nanopositioning systems that features high-bandwidth analog and networkable digital interfaces. The controller integrates a low-noise piezo power amplifier, a high-speed servo controller, sensor electronics for absolute-measuring capacitive nanopositioning sensors, and 20-bit A/D and D/A converters.

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Brushless Motor

Maxon Precision Motors (Burlingame, CA) has introduced the EC-16 sterilizable brushless motor that has been assembled so that the coils are outside the rotor, providing good heat dissipation. Steam sterilization is specified at 273 °F at up to 2.3 bar for 20 minutes. The motor can be sterilized at least 100 times in an autoclave. The diameter is 0.63" with a length of 2.2". Continuous output power is 40 watts, while maximum speed is 50,000 RPM. Ambient temperature range is -4 to 275 °F, and maximum continuous torque is up to 1.78 oz-in, depending on the winding. The motor uses high-energy samarium cobalt magnets for a mechanical time constant of 5 ms. A sterilizable gearhead is available in 55 ratios ranging from 3.8:1 to 4592:1 with a maximum input speed of 8,000 RPM.

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Rotary Transducer

SpaceAge Control (Palmdale, CA) has released the Series R rotary transducer that provides rotational measurements from 1 to 150 turns. The rugged device uses ThreadSensor™ technology for accurate and repeatable measurements in rotational sensing. Applications include potentiometers, encoders, resolvers, and synchros. Dual and quad redundancy features are available in the same package for failsafe or mission-critical applications.

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Software and Hardware Automate Cylindrical Coordinate Measurement Machine Control System

The Mechanical Engineering School at the Georgia Institute of Technology needed to reduce the set-up time involved in centering a bearing ring on a rotating spindle in a cylindrical coordinate measurement machine.

Posted in: Applications, Motion Control, Application Briefs

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Analysis Software Used to Test Solar Car Steering and Stability

The Toronto, Canada-based Power of One solar car was built to set world distance records and promote the use of sustainable energy, unlike most solar cars that are built for racing. Most solar cars are designed only for controlled conditions on a track, but the Power of One project’s focus is practical solar technology that manufacturers can adapt into future mass-produced vehicles.

Posted in: Applications, Motion Control, Application Briefs

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